MOPED ARMY

No. I haven't ever changed the needle. Should I?

oh also check for airleaks

Since installing my current kit with my current setup, I've done 300 miles of some fairly hard riding. Is it safe to say that with the jet I've been using, I will not seize in the future?

If you have steep diverging and converging cones in your pipe design then the carboration requirement will be different when the pipe comes on vs when it doesn't. Its difficult to get the mixture curve to fluctuate in a way that compliments the pipe so you many times end up with a compromize like a bit lean on the pipe and a bit rich when off the pipe.

Ceramic coating, larger clearances and piston cooling mods are important so you don't have to worry about the lean condition when it happends.

Or of course shallow pipe tapers make the carboration easier but with less total horsepower, but how much fun is that.

How long have you been running the plugs you're chopping? Sometimes it just takes a while for a plug to color up.

I'd be careful, a nice colored plug after 70 miles be reflecting that richer top end condition. Keep that 80, and put your needle on the riches setting(so the clip is as near the tapered end as it can get)....if your low end doesn't suffer too much and you still have decent throttle response, you should be fine. At the very lease, make some needle adjustments.